In the northern part of Singapore, near to the Causeway that leads across to Malaysia, there lies beautiful, tranquil and quiet lush greenery and a waterfront park that plays a significant part of Singapore’s history. The Woodlands Waterfront Park was part of the British Naval Base and a few of us explored the history and landmarks behind it, check out Jerome’s post when we went exploring together. Behind the waterfront where the British Naval Base once stood, there is a hill behind it where they also plays a significant part of Singapore’s history that would be shared here today – Marsiling Tunnels. The Marsiling Tunnels had been a destination on my places to visit and explore in Singapore.

During the walk and exploration of the Marsiling Tunnels, I learned a lot more about the history and significance behind the Marsiling Tunnels during the guided tour from the volunteer guides with their vast research and experiences. There had been a few posts on the Marsiling Tunnels by groups such as Asia Paranormal Investigators, Urban Explorers of Singapore and One North Explorers some years ago and I include their links below for your interest and reading reference.

The findings and discoveries by the different groups have shared their views on the history and significance of the purpose and builder of the structure. They cite an old map that marked the land as the Asiatic Petroleum Company’s (APC) Woodlands Depot, and drew the conclusion that the structure belonged to the company and the structure had something to do with fuel storage. The structure’s proximity to the British naval base led them to believe that the fuel stored was meant for the British navy. (Source: National Heritage Board)

National Heritage Board has conducted extensive research into the history, significance and usage of the Marsiling Tunnels that shared new light and perspectives on the Marsiling Tunnels. National Heritage Board obtained highly reliable sources such as the British Wartime Intelligence Reports, specifically declassified documents from UK’s War Office that were obtained from UK’s National Archives through the National Archives of Singapore. (Source: National Heritage Board)

One of the findings and discoveries that I learned during this guided tour was that the Marsiling Tunnels were originally a Royal Air Force fuel reserve depot built in 1942 and not as a fuel storage facility for the British Royal Navy (Source: National Heritage Board).

Since the former British Naval Base was right in front of the hill where the Marsiling Tunnels stood (that stretched from Woodlands to Sembawang Park). I was wondering and thinking ahead, the British Air Force was using Seletar Air Base (now Seletar Airport) during the World War II, did they have pipelines from Marsiling Tunnels to Seletar Air Base or were they using trucks to transport the fuel for the airplanes? This question that came into my mind during the guided tour, it might be something for me to learn more about this interesting finding!

Another interesting finding and discovery about the Marsiling Tunnels was that the Japanese used it too when they conquered and occupied Singapore! In November 1944, British intelligence reports on Japanese defences on Singapore reported that the Japanese was modifying the facility. In fact, according to these reports, the site now had “5 tanks, semi-sunk and earth covered, with storage capacity of some 5250 water tons.”[1]. The Japanese invasion forces therefore used the facility as an oil storage facility. A 1944 air surveillance photo exists showing the layout of the structure and it is unchanged till today.[2] (Source: National Heritage Board)

The Marsiling Tunnels guided tour had some challenging and hilly terrain to trek before you can discover them. Do wear sturdy shoes and bring water along! The tunnel entrances are now sealed and no longer accessible, nevertheless, you will be able to discover where the Marsiling Tunnels stood and how big the whole facility is! The whole structure is still pretty much intact and well preserved in the post World War II period.